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2,3,7,8-Tetrachlorodibenzofuran (TCDF) is a polychlorinated dibenzofuran with a chemical formula of C 12 H 4 Cl 4 O. TCDF is part of the chlorinated benzofuran (CDF) family that contains between 1 and 8 chlorine atoms attached to the parent dibenzofuran ring system. The CDF family includes 135 compounds, of which only a few have been studied.
2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) is a polychlorinated dibenzo-p-dioxin (sometimes shortened, though inaccurately, to simply 'dioxin') [3] with the chemical formula C 12 H 4 Cl 4 O 2. Pure TCDD is a colorless solid with no distinguishable odor at room temperature.
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is the reference chemical to which the toxicity of other dioxins and DLCs are compared. TCDD is the most toxic DLC known. TCDD is the most toxic DLC known. Other dioxins and DLCs are assigned a scaling factor, or TEF, in comparison to TCDD.
Envelope with return address in top left corner. In postal mail, a return address is an explicit inclusion of the address of the person sending the message. It provides the recipient (and sometimes authorized intermediaries) with a means to determine how to respond to the sender of the message if needed.
The following other wikis use this file: Usage on ar.wikipedia.org كلور; العامل البرتقالي; Usage on az.wikipedia.org Kanserogen
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A style of office, also called manner of reference, or form of address when someone is spoken to directly, is an official or legally recognized form of reference for a person or other entity (such as a government or company), and may often be used in conjunction with a personal title.
A registered envelope for Kenya and Uganda from 1930. A scarcity of postage stamps during WWI in German East Africa was the cause for this handstamped envelope. Any indication that postage is prepaid (see top right handstamp) is what makes the item postal stationery. The fact that this indicium was applied to an envelope makes this a stamped ...